Multi-touch and Single Touch interface main difference "turn"

Transferred from: http://blog.csdn.net/eleven_yy/article/details/7723079

On-Billing Point touch event

Input_report_key (input,abs_mt_tracking_id,0);

Input_report_key (Input, Btn_touch, 1);

Input_report_abs (input, abs_mt_position_x, ts->tc.x1);

Input_report_abs (input, abs_mt_position_y, ts->tc.y1);

Input_sync (input);

Up multi-touch events

Input_report_key (input,abs_mt_tracking_id,0); ABS_MT_TRACKING_ID is used to distinguish the coordinates of the first reference.

Input_report_key (Input, Btn_touch, 1);

Input_report_abs (input, abs_mt_position_x, ts->tc.x1);

Input_report_abs (input, abs_mt_position_y, ts->tc.y1);

Input_mt_sync (input);

Input_report_key (input,abs_mt_tracking_id,1);

Input_report_key (Input, Btn_touch, 1);

Input_report_abs (input, abs_mt_position_x, ts->tc.x2);

Input_report_abs (input, abs_mt_position_y, ts->tc.y2);

Input_mt_sync (input);

Input_sync (input);

Adding a multi-touch interface to the input module of the 2.36.28/29

To add a multi-touch command definition:

Linuxsrc/include/input.h

#define ABS_MT_TOUCH_MAJOR 0x30/* MAJOR axis of touching ellipse * *

#define Abs_mt_touch_minor 0x31/* MINOR axis (omit if circular) */

#define ABS_MT_WIDTH_MAJOR 0x32/* MAJOR axis of approaching ellipse * *

#define Abs_mt_width_minor 0x33/* MINOR axis (omit if circular) */

#define Abs_mt_orientation 0x34/* Ellipse ORIENTATION */

#define ABS_MT_POSITION_X 0x35/* Center X ellipse POSITION */

#define ABS_MT_POSITION_Y 0x36/* Center Y ellipse POSITION */

#define ABS_MT_TOOL_TYPE 0x37/* TYPE of touching device */

#define ABS_MT_BLOB_ID 0x38/* Group a set of packets as a BLOB */

#define ABS_MT_TRACKING_ID 0x39/* Unique ID of initiated contact */

#define Abs_mt_pressure 0x3a/* Pressure on the contact area */

/*

* Mt_tool Types

*/

#define Mt_tool_finger 0

#define Mt_tool_pen 1

Add the appropriate handler function in the same file:

static inline void Input_mt_sync (struct Input_dev *dev)

{

Input_event (Dev, Ev_syn, syn_mt_report, 0);

}

Adding definitions in linuxsrc/driver/input/input.c

/*

* Ev_abs events which should not being cached is listed here.

*/

static unsigned int input_abs_bypass_init_data[] __initdata = {

Abs_mt_touch_major,

Abs_mt_touch_minor,

Abs_mt_width_major,

Abs_mt_width_minor,

Abs_mt_orientation,

Abs_mt_position_x,

Abs_mt_position_y,

Abs_mt_tool_type,

ABS_MT_BLOB_ID,

ABS_MT_TRACKING_ID,

Abs_mt_pressure,

0

};

Multi-touch and Single Touch interface main difference "turn"